Based on the aggregated intelligence of 180,000-plus investors participating in Motley Fool CAPS, the Fool's free investing community, airline operator Delta Air Lines (NYSE: DAL) has received the dreaded one-star ranking.

With that in mind, let's take a closer look at Delta's business and see what CAPS investors are saying about the stock right now.

Delta facts

Headquarters (founded) Atlanta (1924)
Market Cap $8.9 billion
Industry Airlines
Trailing-12-Month Revenue $35.8 billion
Management CEO Richard Anderson (since 2007)
CFO Hank Halter (since 2008)
Return on Capital (average, past 3 years) 7.8%
Cash/Debt $3.9 billion / $13.5 billion
Competitors AMR
Deutsche Lufthansa
United Continental Holdings

Sources: S&P Capital IQ and Motley Fool CAPS.

On CAPS, 42% of the 930 members who have rated Delta believe the stock will underperform the S&P 500 going forward.

Just last week, one of those Fools, addikt06, cautioned Fools about getting too excited over Delta's recent move into oil refining:

Expensive stock in volatile industry and an even more volatile economy ... also I am not convinced by this massive investment in a refinery -- [in my opinion] this would work out well if a) Delta had the know how to run a refinery b) demand was high ... but in this volatile industry demand is as random as it can get and if I am reading this right the consumer is going to be hurting again so in the short term this stock is going down going down.

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This article represents the opinion of the writer, who may disagree with the “official” recommendation position of a Motley Fool premium advisory service. We’re motley! Questioning an investing thesis -- even one of our own -- helps us all think critically about investing and make decisions that help us become smarter, happier, and richer.